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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36c5750719ba9aa6405935af6a5cf7974ba82e4a28a19f3a1bb49d7b149dfab' 
  AND token = 'fMJRfIcSSqcq3dGHoxDX2K9ycHykNE0901MCQj365N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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