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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b773ccdb260013bfac31237fab6e9c8ed6752d02ee601e7a7c0da97a784130' 
  AND token = 'wtQf0DhiGGSEAMfAu3xxiVaKG8JUSupvWwxURV3w7M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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