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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca91c87ca03654556c4b8c8265ea342b04095ee6e72368335dfd9067850d89a' 
  AND token = '0np/GQrRoSj76Lgx43OOs60gl+fCqGEexiXopVZqsAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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