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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2ff8b24e55b2e4fe6958a5fcfdc9e1f25b6bd881933ce127ea04fbec2370e1' 
  AND token = 'm8fsw6doziJvw9VIah8Xfmz9dExjEpwivA4LWknZpB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}