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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abba62e185e4c3822577018b340f1c85da5ee8f4781588336120d62511019f44' 
  AND token = '3j7lRn2HOm4FcuVAHqR5A/nK8kareBk07BtYv6qYQ0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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