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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e29a8da93cc318ca8c9c20af2b700f523abd65488daea104264ed5e914c94ce' 
  AND token = 'OMXdzSViivMx2yjTwJiCFEMtQqJliEiZ0iYKpuKUt30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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