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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec73a0b7b455a1353f3e8c1997392ec3d17dc605a7d2c80b75e68470dae0ac4' 
  AND token = 'j1NudfJedTRPl98B7hua1U5fzjd/GDpoOr30ea+IVGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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