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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a4c95e27a96abee5e98dc17c8938a8b6e4e62a8defc38857f076cc7d929af6' 
  AND token = 'b4cHRp8z+7fu9Yf2hSAAVj2ZXisg9M0NuMBLHyUbQYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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