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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770332e96f3a59d6c83a813f1947698fd1c028476051b97cb21decdee632ca7e' 
  AND token = 'vnytB19D7mpawDCVFc8idUKHsAVLwoWr+hwisxxg/3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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