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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34924945c357268ef717e1da0fbb4f5d5eacf687393cc8f40a0fe1318a9ad37a' 
  AND token = 'b7dUktDuta77DTI7BO8BaDK+sSlxohhnpg98MhThWk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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