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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1c28c654cd25224c3c4a8a0e7914677eb2f37c26b0ed471251e6ee848678d5' 
  AND token = 'A37GUNwJMHsPHqS6LjmkT4zyNUew+TmKj5KiLRI/BfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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