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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9260ea99af4e07836a394ea5114cb4defd14869a2547bc6bfee64d281c8bcc90' 
  AND token = '+rqiuJXRj79yHBx4WZqPiw9/FOt2KXmxs2bwk+43NAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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