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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31def0dd1786731c59508459a87d01fa7421d11871104e5a3869a33d314db3a' 
  AND token = 'afR53TyOwEUk1NZVQI1BQhRoLrKY3Ihvzk5mZQSlGPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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