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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0312d9113b4397b6d8669e178b1f27bbaac910329ff097e505be5e2c94ed5e' 
  AND token = '4ZkHWf0VzCNJsUgNSnR7bstF4Hy6/h40TxEpv9tfj8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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