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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26dc67e7be7e4b4e3e589108630b904e17c9d535cdd042eee07bb188ae614a6b' 
  AND token = 'hAotkcU1SFhg2xz7Nn8hqlwdPFvt1JB8oDWqmL2aLps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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