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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256e3971e6f4415054cbd65c0bea94e80dbc2852fbc27177569e8f1e684d6a8c' 
  AND token = 'K/q16LkS14eBB1Q23OszZX1eggSm07c49qaAS96e4xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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