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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e3ada5b830f5234d4a83bd0d3a11b5f66f93c688bc1859aaa2ec500b939960' 
  AND token = 'gerGzOr2UQyHBLTQTgXqBRy1mgNpfDMOhUWxzl0t7r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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