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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a21b19f3401dad1bad8f9ac6e6a38f02aa9f3a5afd9f6adbe14da7acbe98bbb' 
  AND token = 'TMvaFOSo0LWLFDhESFxOs4yVILKD7/OXFfhehq75088=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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