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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea8468e7ff9eb932f6f321be2068d6d81ed3ff38a223d9f67d09c403d0e2c1d' 
  AND token = 'eRXWaedKw69rPDz5lIpqFnaLU72/n8BUqjzPXT9NV8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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