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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438c5a605a29380c2f4663146ec0f5e73b9dc407cc97e66dd17477cff922eb50' 
  AND token = 'HEmJiqy2UNO2RZQ/RbL2NHZizXKUA6spQHNlA1AILMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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