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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac77eb8abfa1e6c3a94e1d3ade5afaf4910d84a985cdb03e3f08545bb1d0e550' 
  AND token = 'SKCOuIuv74/FCa+ZxmrdXk4MbvXQF9NUOGj7woURB8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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