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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffa6ef49ef0b20034009c81709bee11edd6958ea9e4fd998cfc94c72a69b24f' 
  AND token = 'yS8+Ouu6Dw7M8zpjbshJqyOzOZ3P8/1Zsgd5+aiAmdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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