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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d562278976003af0b2c97bfe7f60f108f69fe47719d91defa953d4431ff27d' 
  AND token = 't60nkNt3Yf4PJ5dTervjp9a6cxtINb7hG3x8bt13Uig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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