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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb08296d2d3e931075f10e55bbcebc6889a3a9def4498a82aea65a3211331e5' 
  AND token = 'rHZM3sBUZGYAbuY2dFwPTwiIjYebT+hk1f3SNyTeJ4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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