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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa118403fd90a7fcf53c252d6a446aa6c41004a53a5943530c0385b6926dfe3f' 
  AND token = 'Z4eMvaq3bTlGwC5eR0g1jbrLHMb+fNSVUdir57ZJ9/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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