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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741ac3e7761cbc1bed750ec363ff476bd835249267b16908682e5d705e31ef63' 
  AND token = 'zBkDp+dI4Qbmixac9QuPrRghUv5PpJs73fVeNo67QsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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