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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b934d86cb8136cc9cd9ab2a1d56eb8f3bc58e21bd13e2d77b1928378f9c3ff11' 
  AND token = 'csI3HR4kQ3f8d8mus7wuO3yLBi0b1uUk1t7cDP4/wok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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