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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03092b17c1a50fa919515492ac0e6239f57ac635628d63ee81e1e2a04c0b452f' 
  AND token = 'rej15ohI6lFMTyVn5WqVPCktgDKjtWL8ax3+WxPJF+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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