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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a6fd301dce49b9075b3ff479e7c3a2a3117ec8697cdee21879128dc74b3cac' 
  AND token = 'mLYCdRro9w8LN0fnAhvT0tNO2LmbwOayHLRr3qTgso0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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