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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1551f3f531a9c810877a73423eb247e767e05b679edaac63558346efab3989fc' 
  AND token = 'NaKVV1aCSP2SfuS82Zhmi49qi2sx6Osq8FiEG5xk13s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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