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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5135a246593f2793fdd70d18435a614afc15af41714e7282dccfcef4695d69' 
  AND token = 'cVAr4WxxqcOUCqnEcgZQnNm9JOmO2nw4kMSO4fJE6sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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