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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07693cc1e262d21b55a9732d5dd30939173fcb1828bc557cd99f9da4ce5e61a5' 
  AND token = 'ZpPs2bQiq4FuScL5A3bqh3tvVVD6zo4V3Z9n7V+Mo4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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