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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3d60d3081a854778f4421deadb8f84964724fd09b7e2ac2743ccc042cede7f' 
  AND token = '0LertnCW0oqiJWGTRj543ofiecnnsueH/7kxfPPe+LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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