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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e786b3b5d770a780dcf432ed155bb6137557f8a223536c0d2592cac39fcc8e68' 
  AND token = 'OGPE3tHASZVm4AQWS6PIQPGCSOEo7REGrCttCCz3Ck0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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