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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83bbaac9d11ae7ca967722109bd51eb4288744d1a2e5772f64b804e367984b5' 
  AND token = '3R7QMa9fdCRcgjSry7/OQRfJ57uL9QSO42b7VPs3RH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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