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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce074ccae9e816933b883296e1a7ca26571425817e941baa4a5e2ba0f493a2d' 
  AND token = '6M0SOqOdSqI2pMbaIIYLkJT8Tta7J29wQW+PHEn2XgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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