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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd60e318da8e396b7f8a2ae1ad688ca0a1dd9043cc8974ca448b4380937df6bc' 
  AND token = 'ieks/XPvZ6XE19I844+Sfhtnk6nO09rxz2XEX7Nhh0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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