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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e264c85b0b0ae33483a24e52f2da66db6aa4d17a40ef84d785918869e075c1' 
  AND token = 'H7T+7KRfNFP9zafMzxuyJ1sTXiuf2WyIXFgpkzd9s2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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