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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016f555e3f5f8c13df3f1d1a3f0ec44f145e279cc65a898ff4a937c82afd00dc' 
  AND token = 'X85WkgjWu+k3l4WbArRAq+Mlziag9hg12rKF6wf0af8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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