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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd583a1f14f059684f2d148e8e886e3922fb6b1060bc3b02632f7e6f6f06d73fc' 
  AND token = 'nvfunX02YNEJUw7jiYkc39GbCkiJK7ME0dJQ8YZ/6JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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