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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9db114aed82aae842cc77ef940000707acace3617ee712d5b0446e8d5192b42' 
  AND token = 'TOCtmNfCMXEEcgP9j3ZC3IgwKJ4URm0hqxJv9c3tmec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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