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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b155ecd5ebb1dc5ac83c42b993621f050456891844fb879d3c599fed6bddbe' 
  AND token = 'iOirP+LSJyasmb4y0ImzysCd1l9KQxSAxavcMV0A5ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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