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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d96b54893911de387f5bce85b76e3560e1605332b8e6688a5081d50e9354991' 
  AND token = '0kHGsSF6WbThpSf9T72XL8I2COmTaRa4Bd8wcaHfz/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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