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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c85df2f3de29fccc274ed0610a6e66c6b642ae042de0b2a85a4510fa173e4e' 
  AND token = 'IgubjA9xfxgj2okOvjJJretVPmCfP+zHufwpiebyitE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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