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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3142819c64d9df35cc2fd409e14752472183063b6189cfec73e91720313797af' 
  AND token = 'nUgug0vBQ4llu365t2k82B/0TlBoUHxsAQEgsBGqyFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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