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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09151924c2c3679ab717b74e4e9e1dcbdd0442c2e7185102a333c0179643828' 
  AND token = 't083d8bn4wptSrjBT5Qc1skfm6UTYaAL5Wo7g0jYY+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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