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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a41feed8d833e4901fdf3ea12acbb840dd3d35e92067fd49f42ac04460c6c1e' 
  AND token = 'DdK+GGBO2uZ2SyTOK9E5fInG+4xxgi7Rr02yZtnMF3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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