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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb008ecc242997d34d0e3839108c4296b7d26d04df2ecca5d4eee9c1d9de283' 
  AND token = '2aeNsJWlMvyTNNO1zVALFjNuZoNrbb3wY4nli52GEiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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