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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071a4d366ae8b3c4fa89bbfa97b98c8aebaa7ce117c0ebbf5d6e1d210e5f357f' 
  AND token = 'YsVhcC0GBUlZlxqaKs8Bw3z8U92p6XDpY9L5bx8PKdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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