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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7103a3db41bd162a774e8e7c559b1a121512e12000161c42668becd9d4ead3' 
  AND token = 'MaczdkACsAmb3wLvDXuEfGqoat3A/pQ0mvGmNT109hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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