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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ec8791f418d44ac36f491db9626b637371c23ab81ee39f482a895da8f4a9b1' 
  AND token = 'txvis7JI7iyoYyW4GQXZ5hPdZ7N8d/TfnGTaro26FUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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