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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669c68dd2ce5579dbac46e8974c66f8f777f44e7596fac00dda6c6d167ebeffc' 
  AND token = 'ugnDnKy8sujujF6yoRNlbluxrAMqjvB4nWAfCSBFq1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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