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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830342f31cf69f8fca691b4a784801c395fb796f4734c78501b5da828ca54c9c' 
  AND token = 'Akr6Oz2WzMPeUIPyV7Bs06fJTxONVioyS6q6guYmPs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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