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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5192000390df682f1ff3259fb65ee5e1c0eedacd096a1c1fa710bc4c39e15e56' 
  AND token = 'NM2UpE26QQGpfn9RBd6ZZ/j8QNOtc4Skli0PmDMBk34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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